Primary signal detection algorithms for spectrum sensing at low SNR over fading channels in cognitive radio

The generalized detector (GD) can be implemented at the low signal-to-noise ratio (SNR) in cognitive radio (CR) systems to improve the spectrum sensing performance under correlated antenna array elements. The weighted GD (WGD) and the generalized likelihood ratio test for GD (GLRT-GD) are proposed t...

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Bibliographic Details
Published in:Digital signal processing Vol. 93; pp. 187 - 207
Main Authors: Shbat, Modar, Tuzlukov, Vyacheslav
Format: Journal Article
Language:English
Published: Elsevier Inc 01.10.2019
Subjects:
Antenna array
Cognitive radio (CR)
Energy detector (ED)
Generalized likelihood ratio test for GD (GLRT-GD)
Optimal detection threshold
Probability of error
Probability of false alarm
Spectrum sensing
Weighted generalized detector (WGD)
Weighted generalized detector (WGD)
Spectrum sensing
Energy detector (ED)
Probability of false alarm
Probability of error
Cognitive radio (CR)
Generalized likelihood ratio test for GD (GLRT-GD)
Antenna array
Optimal detection threshold
ISSN:1051-2004, 1095-4333
Online Access:Get full text
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Summary:The generalized detector (GD) can be implemented at the low signal-to-noise ratio (SNR) in cognitive radio (CR) systems to improve the spectrum sensing performance under correlated antenna array elements. The weighted GD (WGD) and the generalized likelihood ratio test for GD (GLRT-GD) are proposed to be used for coarse spectrum sensing when the noise power is known and unknown, respectively. The GD optimal detection threshold is defined based on the minimum probability of error criterion for various fading channels, namely, the additive white Gaussian noise (AWGN), Nakagami-m, and Rayleigh fading channels. The performance of the proposed algorithms are compared with the spectrum sensing performance of the energy detector (ED), weighted ED (WED), maximum-minimum eigenvalue (MME) detector, generalized likelihood ratio test for ED (GLRT-ED), matched filter (MF), arithmetic to geometric mean (AGM) detector, scaled largest eigenvalue (SLE) detector, moment based detector (MBD), covariance based detector (CBD), and others. The simulation results demonstrate superiority in the spectrum sensing performance of the proposed algorithms in comparison with the above-mentioned detectors. For example, the GLRT-GD achieves the SNR gain equal to 1.2 dB, 4.0 dB, and 4.5 dB in comparison with GLRT-ED, MME, and GM detectors, respectively, at the probability of false alarm PFA=0.1. The WGD and GLRT-GD implementation allows us to achieve a considerable spectrum sensing performance improvement at small number of samples under the low SNR and the correlated antenna array elements.
ISSN:1051-2004
1095-4333
DOI:10.1016/j.dsp.2019.07.016